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UNITED STATES PATENT Carica.

4 LOUIS1 RAEGKILOF YORK, N. Y.`

y iii/iPuoi/ENIENTiiNFiLriERsQH Specification forming `part of Letters retentit). "i1 l ,omvatten January 1?, 18:1', antennae: i,

-` i il `i January?,18,71.` i j t i, Lotus nancial, of the .0ity,l`iinty,land

` State-of ,New York, have inventedyagcertain Im provenientiin Filters, i of i which the follow-1 ing isa specification; Y l Nature mdfObjcctof the latent/ion.

. The invention'belongs to that class of filters in which the filtering-medium iscoinposed of wool, cottonfelt, or otherlfibrous material,

c held inplace bya sieveat the topandibottom lina vessel with solid sides, and through which i the liquid is `passed withl r withontpressnre,

c and in a heated or unheated state` Under this sieve is the ltering materialwool, cotton, felt, or any fibrous mass-supported at the bottom by a second sieve. i This second sieve rests upon a shoulder projecting fromV the inner side `of the cylinder, and may i or not be fastened,as in the former case. Alt

the bottom of the cone is a faucet for drawing oft' any filtered liquor that may remain iinpure after having passed through the filter. At or near the` junction of the cylinder and the cone, and below the second sieve, is another faucet, for drawing off the pure liquor after filtration. t

The upper sieve is placed about one-third the height of the cylinder from the top. i. The lowerA sieve is near the junction of the cylinder and cone. l

The second feature of my invention consists in the construction upon the second sieve of a `flange, which runs around (about one or two inches from the walls of the cylinder) the whole circle, and rises perpendicular to the surface from one to three inches, according to the size of the vessel.

The third feature of my invention consists in packing the filtering material densely between the ange above named and the walls of the cylinder, to prevent the liquid from flowing along the sides of the cylinder and passing through the sieve without iiltration.

-" The fourthpart of myinventionconsists in` inclosingthe above-describedvessel in another c vessel, leaving aspace t between the i `two for .holding hot water orsteain, with which the t liquid to be filtered can be ;l1eated it' required.` t

` i Description of the Accompanying Drawing.

Figure lis an upright sectional view ofthe l'ter by aline drawn through the center. Fig. 2 is a view of the lower sieve andflange.

ci is the `outer cylinder or vessel to contain `the hot Wateror` steam. This should correspond in shape with the inner-vessel or filter,

andthe most convenient form forboth is cylindrical, though theshape is not important. It Mshould be `madeso much larger than `the filter that the space bin the drawings, between the two, will hold water or steam suicient to im i part to the liquid to be filtered the necessary degree of heat. c is the inner or ilteriiigvessel, containing the sieves and filtering material. Its lower eX- treinityterminates in or joins upon a cone, d, which is designed to receive such liquid as may be found to be impure after passing through the filter.4

Sometimes i the filtering, material, even though new or freshly washed, will contain i and impart to the liquid passing through it impurities. In such case this impure liquid" should be allowedto run down into the cone d and pass out of the faucet e in the apex of i h and j. One, j, nearest the top ofthe vessel,

rests upon two knobs or shoulders in the sides of the cylinder, and may be fastened with i hooks or buttons or other device. The other sieve, h,-is placed an inch or two above the junction of the cone and the cylinder, and rests upon knobs or shoulders fixed in the Walls of the cylinder.

Parallel to and oneor two inches from the outer'edge of this sieve, and rising at right angles to its surface, is Xed a stiftl flange, 7c, from one to three inches high. This flange must be sufficiently stift` to bear the pressure occasioned by densely packing the filteringV material in the space l between it and the walls of the cylinder.

Between the two sieves j and h the space 2 f uLooi is lilled with wool, cotton, or other fibrous v material or felt, packed with sufficient density to insure the purification of the liquid passed through, and at the same time not to prevent its free passage.

One feature of my invention which I esteem of great importance is the mode of packing the filtering material in that part of the space f t' which lies between the flange 7c andthe walls of the cylinder.

One difculty of frequent occurrence in ltering is the tendency of the Huid to'find a passage along the walls of the vessel and out the sieve in an unfiltered state. I obviate 'this by packing the space i very closely with Vthe filtering material-so closely that, though the fluid to be filtered may, and probably will,

run down along the walls of the cylinder in an unfiltered condition, yet when it comes to this point it will be and is forced, by the density of the packing, to pass away from the walls and find a passage through the ltering material, and come out pure, drawn with the rest of the liquor through the faucet j', provided for that purpose.

` If the substance to be filtered requires to be softened or made thinner by an increased temperature, then hot water or steam can be applied, in any convenient manner, between the inner and the outer walls. When this is not required the inner or filtering vessel can be used without the outer case.

The size of the llangeand the distance it is placed from the wall of the `cylinder must be adjusted to the size of the filter. In a filter fifteen inches high and six inches in diameter I make the flange about one and one-quarter inch high, and place it one inch from the side of the cylinder. flange and space should be altered accordingly.

g is a faucet for drawing hot water from the space between the two vessels.

`I claim, and desire to secure by Letters Patent, the following7 viz l. In a filter, a sieve constructed with a flange so placed on its surface as to leave a spacebetween the said'flange and the walls of the filtering-vessel.

Y 2. Packing the spacelbetweeu the flange 7c and the walls of the cylinder so closely withv the filtering material as to prevent the iluid from passing down the said walls and out the sieve in an impure state.

3. A filter constructed and arranged as herevinbefore described-wiz., having two sieves,

with a filtering material of wool, cotton, felt, or other fibrous material between the saine, and the lower sieve'having on it a flange, lr, all combined with the vessels a and c, all as and for the purposes described.

L. RAEGKE.

Witnesses: v

GHARLEs E. SOUTHER, MICHAEL PHILLiPs.

If the filter is larger, the 

